“Oxytocin is an ancient neurotransmitter chemical. Animal lineages much older than the mammals—amphibians, reptiles, worms, even the egg-dumping fish—all sport some version of it. For hundreds of millions of years animals have been practicing sexual reproduction. And for that long… — Hannah Holmes Copy Share Image
“Neurotransmitters are chemical-like substances that travel between nerve cells across a synapse and determine whether a nerve signal keeps going or halts. Levels of two of these neurotransmitters, dopamine and serotonin, decrease during adolescence. The decrease in dopamine results in… — Richard Guare Copy Share Image
